
One or both of the trains on this route keep going "No Path".
It's a simple intersection, with two trains that run forward-and-reverse between outposts and my base. The tracks are highlighted in different colors, indicating that they are different blocks, so the signals should not prevent normal operation unless there's a train passing through the intersection.
There's one signal at each side of the intersection, but the game does not let me freely choose which side of the tracks the signals go on (as you can tell from the photos).
What on earth am I doing wrong?
This should not be anywhere near as difficult as it is. I've had this problem in previous games, and have just given up and either not run the train, or run long parallel routes to avoid crossing tracks.